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SC 30224 Electrochemistry

Total questions: 53

Worksheet time: 27mins

Name
Class
Date
1.

Which of the following is true about an electrolyte?


I Electrolyte conducts electricity in molten state.

II Electrolyte conducts electricity in solid state.

III Electrolyte is soluble in water.

IV Electrolyte undergoes chemical decomposition when it conducts electricity.

a)

I and II only

b)

II and III only

c)

II and IV only

d)

I and IV only

2.

Which metals rusts?

a)

Copper

b)

manganese

c)

iron

d)

potassium

3.

What environmental element assists rusting?

a)

nitrogen

b)

oxygen

c)

carbon

d)

hydrogen

4.

A rusting bicycle

a)

physical change

b)

chemical change

5.

What conditions are required for rusting?

a)

dry cold conditions

b)

dry hot conditions

c)

hot damp conditions

6.

What is the chemical name given to Rust ?

a)

Iron dioxide

b)

Iron oxide

c)

Steel oxide

d)

Carbon dioxide

7.

What prevents Rusting

a)

Painting , Oiling , Galvinising

b)

Washing with water

8.

What prevents Rusting

a)

Painting , Oiling , Galvinising

b)

Washing with water

9.

What type of reactions can able to change products back to the their original form?

a)

Reversible reactions

b)

Irreversible reactions

c)

Combustion reactions

d)

Combination reactions

10.

burning wood is ........... change

a)

Reversible

b)

Irreversible

11.

A green powder is heated & a gas is given off while it turns to a black solid. This describes

a)

Physical Change

b)

Chemical Change

c)

Change in State

d)

Change in Temperature

12.

A green powder is heated & a gas is given off while it turns to a black solid. This describes

a)

Physical Change

b)

Chemical Change

c)

Change in State

d)

Change in Temperature

13.

Sometimes I notice rust on the metal part of the nozzle of my garden hose, how or why scientifically does this happen?

a)

water running through the nozzle causes it to rust

b)

rust or corrosion appear on metals over time

c)

nozzle was damaged and exposed to water

d)

iron in metal nozzle combined with oxygen in the air to form rust or iron oxide

14.

When we combine baking soda and vinegar, it fizzes and eventually turn into a liquid. What is actually happening?

a)

baking soda melted into its liquid form

b)

baking soda combined with the vinegar produced a new substance

c)

evaporated into the air

15.

What element rusts?

a)

carbon

b)

manganese

c)

iron

d)

potassium

16.

What is the chemical name given to Rust ?

a)

hydrated iron(I) oxide

b)

Iron (I) oxide

c)

iron(II) hydroxide

d)

hydrated iron(III) oxide

17.

Which of the following does not prevent rusting of iron?

a)

Painting , Oiling , Galvinising

b)

Attach to a piece of copper

c)

connect to a piece of magnesium with wire

d)

cover entirely with copper

18.

In which tube will the nail go rusty?

a)

The nail in tube A will go rusty.

b)

The nail in tube B will go rusty.

c)

The nail in tube C will go rusty.

19.

What metal from the list below does not corrode ?

a)

Iron

b)

Steel

c)

Gold

d)

Magnesium

20.

The diagram shows mechanism of rust formation.


Choose the correct statement:

a)

an iron atom release two electrons to form an iron(II) ion

b)

an iron(II) ion receives two electron from an iron atom

c)

an oxygen molecules receives two electrons to form hydroxide ion

d)

four hydroxide ions are formed when two water molecules receive four electrons

21.

During rusting, the iron block also works as a voltaic cell.


Which of the following statements explain this

a)

there is water present

b)

metal iron is present

c)

iron atom loses electrons to oxygen and water

d)

iron block is corroded when in contact with oxygen and water

22.

Diagram shows a voltaic cell on the iron block during rusting.


which of the following reaction occurs at cathode?

a)

Fe --> Fe2+ + 2e

b)

Fe2+ + 2e --> Fe

c)

O2 + 2H2O + 4e --> 4OH-

d)

4OH- --> O2 + 2H2O + 4e

23.

Which metal container causes the iron nail to corrode fastest?

a)

Magnesium

b)

Silver

c)

Lead

d)

Tin

24.

Rusting occur in the presence of

a)

oxygen

b)

water

c)

hydrogen

25.

Corrosion of metal is a redox reaction

a)

Yes

b)

No

26.

During rusting, iron undergoes oxidation to form

a)

water

b)

Hydroxide ion, OH-

c)

Iron(II) ion, Fe2+

d)

Iron, Fe

27.

which one is the correct equation for reduction during rusting?

a)

Fe --> Fe2+ + 2e

b)

4OH- --> O2 + 2H2O + 4e

c)

Fe2+ + 2e ---> Fe

d)

O2 + 2H2O + 4e ---> 4OH-

28.

When Iron in contact with magnesium, which one corrode first?

a)

Iron

b)

Magnesium?

29.

How can we control metal corrosion?

a)

Alloying

b)

Galvanising

c)

Sacrificial protection

d)

Expose to sunlight

30.

The correct formula for rust is

a)

Fe(OH)2

b)

Fe

c)

Fe(OH)3

d)

Fe2O3.xH2O

31.

What element rusts?

a)

carbon

b)

manganese

c)

iron

d)

potassium

32.

What is the chemical name given to Rust ?

a)

hydrated iron(I) oxide

b)

Iron (I) oxide

c)

iron(II) hydroxide

d)

hydrated iron(III) oxide

33.

Which of the following does not prevent rusting of iron?

a)

Painting , Oiling , Galvinising

b)

Attach to a piece of copper

c)

connect to a piece of magnesium with wire

d)

cover entirely with copper

34.

Which is NOT the characteristic of rusty object?

a)

Brittle

b)

Rough

c)

Reddish brown layer

d)

Shiny

35.

Which of the following can rust?

a)
b)
c)
d)
36.

What are the characteristics of a rusty object?

a)

white spot on iron surface

b)

colour changed to reddish-brown

c)

rough on surface

d)

Stiff and brittle

37.

Rusting process only occurs when there is a presence of both water and air ( oxygen).

a)

True

b)

False

38.

Which of the following items will rust?

a)

A plastic bottle

b)

A gold bracelet

c)

An iron bridge

d)

A cardboard box

39.

A layer of reddish brown on surface of a metal is called

a)

red paint

b)

red dirt

c)

rust

d)

brown rust

40.

All of the following shows the ways to prevent rusting except .....

a)

Painting

b)

Plating

c)

Apply vinegar

d)

Coating

41.

Both magnesium and zinc can be used for sacrificial protection of iron. Why?

4 lines
42.

Iron that is tin-plated does not rust. Why not?

4 lines
43.
a)

A

b)

B

c)

C

d)

D

44.
a)

A

b)

B

c)

C

d)

D

45.
a)

A

b)

B

c)

C

d)

D

46.
a)

A

b)

B

c)

C

d)

D

47.
a)

A

b)

B

c)

C

d)

D

48.
a)

A

b)

B

c)

C

d)

D

49.
a)

A

b)

B

c)

C

d)

D

50.
a)

A

b)

B

c)

C

d)

D

51.
a)

A

b)

B

c)

C

d)

D

52.
a)

A

b)

B

c)

C

d)

D

53.
a)

A

b)

B

c)

C

d)

D

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